Telegraphy.



Patented Nov. H, I902.

H. A. ROWLAND, Decd.

H. H. ROWLAND, Administratrix.

TELEGR AP H Y.

(Application filed June 4, 1900.)

I9 Sheets-Sheet I.

(No Model.)

No. 713,497. P t u :9 2.

H. A. ROWLAND, Decd. a 0 H. H. ROWLAND, Administratrix.

TE LEG RAPHY.

(Application filed June 4, 1900.)

I9 Sheets-Sheet 2.

(No Model.)

N0. 78,497. H A. ROWLAND, 966,6. Patented Nov. ll, I902.

H. H. ROWLAND, Administratrix.

TELEG RAPHY.

(Application filed June 4, 1900.)

I9 Sheets-Sheet 3 (No Model.)

6 tor/magi No. 712,497. I I

H. A. BUWLAND, ne Patented NW 02 H. H. ROWLAND, Administratrix.

TELEGBAPHY.

m0 ModeL) (Application filed June 4, 190

I9 Sheets-She'd 4,

H- A. ROWLAND, Dayd- Patented Nov. Il, I902. H. H. ROWLAND.Adminisirairix.

TELEGBAFHY.

(.iio Model.)

(Application filed June 4, 1900.) I9 shets she8t 5' 1 Z61 JJDi-tmaows awewboz I. I 49 10 7 3, 7 H. A ROWLAND, Dem" Patented Nov. ll, I902.

H. H. ROWLAND. Administratrix.

TELEGRAPHY.

[N0 Modem (Application filed June 4, 1900.

I9 Sheets-Sheet 6.

no Whoa 2/91 Ema/50% w No. 713,497. H A. R A Deva. Patented Nov. II,I902.

H. H. ROWLAND, Administrairix. TELEGBAPHY.

(No Modal) (Application filed June 4, 1900.) I9 s t s 7 No. 713,497.Patented Nov. II, I902.

H. A. ROWLAND, Decd. H. H. ROWLAND. Administratrix.

TELEG RAPHY.

(Application filed. June 4, 1900.)

I9 Sheets8he'et 8.

(No Model.)

Ejvwemboz mmvfldzw N0. 7|3,497. H. A. ROWLAND, Deem- Patented Nov..|l,I902.

H. H. ROWLAND. Administratrix. TELEGBAPHY.

(Application filed June 4, 1900.)

I9 She'ets-Sheet 9.

(No Model.)

7 1% flttowu o N0. 7l3,497. Patented Nov. ll, I902.

H. A. ROWLAND, Decd. H. H. ROWLAND. Administratrix.

TELEGRAPHY. n modem (Appli filed June 4. :9 Sheets-Sheet I0.

I mllmmmm J JWL w. m f m Q.

m. 713,497. P te t d No 1|, |902..

H. A. ROWLAND, Decd. a e v H. H. ROWLAND, Administratrix.

TELEG R APHY.

(Application filed. June 4, 1900.)

I9 Sheets-Sheet 13..

(No Model.)

Um hH awwamtoi N I3 49 0 7 7 H. A RUWLAND, Demi- Patented Nov ll, I902H. H. ROWLAND, Administrairix.

TELEG RAPHY.

(Application filed June 4, 1900.)

I9 Sheets8heet I4.

(No Model.)

m RN i Am TH NAN N0. 7:3,497. Patented Nov. n, I902. I

H. A. ROWLAND, Decd.

H. H. ROWLAND, Administratrix.

TELEGRAPHY.

(Application filed June 4, 1900.)

(No Model.)

L'IIIIII/(I/Id woawboz No. 713,497. Patented Nov. H, I902. H. A.ROWLAND, Decd.

H. H. ROWLAND, Administratrix.

TELEGRAPHY.

(No Modem (Application filed June 4, 1900. 19 s t -s FIG. 35.

Q-Qihgwmca Q), M

No. 78,497. Patented Nov. ll, I902. H. A. ROWLAND, Decd.

H. H. ROWLAND. Administratrix.

T E L E G R AP H Y.

(Application filed June 4, 1900.

l9 Sheets.Sheet 17.

(.No Model.)

Gbtowmag;

2 0 m V 0 N d e n e a D! n cr- 8 Dw. mm wimp A mu 0 EN I u H(Application filed June 4, 1900.) I9 Sheets Sheet [8.

(E0 Model.)

UNITED STATES PATENT OFFICE.

HENRY A. ROWLAND, OF BALTIMORE, MARYLAND; HENRIETTA- H. ROW- LANDADMINISTRATRIX OF SAID HENRY A. ROWLAND, DECEASED;

TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No; 713,497, dated November11, 1902.

Application filed June 4, 1900.

To aZZ whom, it may concern:

Be it known that I, HENRY A ROWLAND, a citizen of the United States,residing atBaltimore city, in the State of Maryland, have inventedcertain new and useful Improvementsin Telegraphy; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itapl0 pertains to make and use the same.

This invention relates to improvements in electric telegraphs, and moreespecially to that class of telegraphs known as synchronous multiplexprinting-telegraphs, in which is a number of messages may be sent over asingle line simultaneously and automatically printed in typographicalcharacters.

The principal objects of this invention are, first, to increase thecapacity of telegraphlines by enabling one line-wire to do the work of alarge number of wires; second, to facilitate telegraphic communicationgenerally by simplifying the work of the transmitting operator andsupplant-ing the receiving opera- 2 5 tor entirely by a machine whichwill automatically record the messages in printed characters and in pageform; third, to render possible the transmission of telegraphic messageslong distances without relaying them, and,

fourth, to produce a telegraph system of the class above referred to inwhich there is no decrease in speed by increasing the length of theline, all of which, together with other objects hereinafter referred to,the said invention is designed to accomplish in a commerciallypracticable manner. 7

To these ends the said invention embodies a system of telegraphy inwhich the messages are transmitted by impressing an electrome- 0 tiveforce rising and falling in value upon a main-line wire and cutting outor otherwise modifying apreselected number and combinationot the waveimpulses of the current produced by said electromotive force for eachcharacter and locating at the receiving-points printers adaptedto printthe characters represented by the combination of suppressed andunsuppressed line-current impulses. A single main line carrying thissignaling-current is 'made to accommodate a number'of messagessimultaneously by locating at the ,diiferent stationssynchronously-operating Serial No. 19,070. (No model.)

current-distributingapparatus,by which each of a series of localtransmitting and receiving instruments is given the use of the main lineat regularly-recurring brief periods of time.

In order to maintain the current-distributing devices above referred toas well as other devices in synchronism, this invention embodies a novelsystem of producing synchronous motion, and though it is herein shownapplied specifically, as above mentioned, it is indeed capable of muchbroader application. v

This invention also embodies in connection with the above synchronoussystem a system of circuits and connections such that the synchronism ofthe apparatus remains uninterrupted, notwithstanding the frequent andrepeated interruptions of the main-line signaling-current.

In addition to the features above. referred to this invention comprises,among other things, an improved form of keyboard for transmitting themessages as described; a damper fordamping any motion of an oscillatingnature, but here specifically used in conjunction with the synchronizingmechanism; an improvement in the duplexing of a linewhich adapts it tothe system herein described; circuit combining and distributingapparatus operated in conjunction with the printer, and, indeed, manyother accessories necessary to the completion of a commerciallypracticable form of multiplex synchronous telegraph designed to increasethe capacity of telegraph-lines and reduce the cost of maintaining thesame.

In carrying out this invention the line signaling-cn rrent that has beenfound preferable is the gradually-varying or approximately.

sine-wave alternating current such as produced by the commercialalternating-current generator,though this invention is not limited tothis or any other form of alternating or pulsating current. Thus, forexample, such a current as that produced by the Wheatstone,

transmitter or vibrating current-changer of any desired description may,be used, and in any case the current may be derived either directly fromthe generator or from some secondary source, such as a transformer.beassumed, however, for the purpose of the following description thatthe line signaling- It will 7

